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BBO crystal with special chamfered angle, triple-frequency optical converter and working method of triple-frequency optical converter

A frequency-tripling and frequency-doubling light technology, which is applied in the field of laser and nonlinear optics, can solve the problems of easy gray stain damage, low effective nonlinear optical coefficient, and high component dependence, and achieve UV light damage resistance The effect of high threshold, large nonlinear coefficient and wide working band

Pending Publication Date: 2018-03-02
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Overall, the effective nonlinear optical coefficients of the above-mentioned crystals are generally not high, and KDP and ADP crystals have deliquescent properties, while Gd x Y 1-x COB crystals have high dependence on components and are prone to gray stain damage when irradiated by ultraviolet light. These factors limit the application of the above devices to varying degrees. It is expected to make up for the above deficiencies by finding new nonlinear crystals and cutting shapes.

Method used

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  • BBO crystal with special chamfered angle, triple-frequency optical converter and working method of triple-frequency optical converter
  • BBO crystal with special chamfered angle, triple-frequency optical converter and working method of triple-frequency optical converter
  • BBO crystal with special chamfered angle, triple-frequency optical converter and working method of triple-frequency optical converter

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Embodiment 1

[0041] A special cut corner BBO (β-BaB 2 o 4 ) crystal, its phase matching angle decreases with the increase of the working wavelength of the fundamental frequency light. When the working wavelength of the fundamental frequency light gradually increases from 750nm to 1200nm, the phase matching angle θ corresponding to the BBO crystal gradually decreases from A to B, the value range of A is 42.1°-52.1°, and the value range of B is 24.2°-34.2°, the azimuth angle φ of the BBO crystal is 6°-16°; the polar coordinates (θ, φ) represent the spatial direction of the BBO crystal, and the phase matching angle θ is the angle between this direction and the optical Z axis The angle φ is the angle between the projection of this direction on the XY plane and the X axis; the length of the BBO crystal in the direction of light transmission is 6-14mm.

[0042] Based on the above-mentioned BBO crystal, efficient cascaded triple frequency of near-infrared lasers in the above-mentioned bands can...

Embodiment 2

[0071] According to the BBO crystal with a special cut angle described in Example 1, the difference is that,

[0072] When the wavelength of the fundamental frequency light is 750nm, the phase matching angle θ of the BBO crystal is 42.1°-52.1°; when the wavelength of the fundamental frequency light is 950nm, the phase matching angle θ of the BBO crystal is 30.8°-40.8°; when the fundamental frequency light When the wavelength is 1064nm, the phase matching angle θ of the BBO crystal is 27.1°-37.1°; when the wavelength of the fundamental frequency light is 1200nm, the phase matching angle θ of the BBO crystal is 24.2°-34.2°.

[0073] The actual processing angle can be selected between type II frequency multiplication and type I sum frequency phase matching direction, and the best cutting angle is the average value of the two for the convenience of adjustment. combine figure 1 , the technical solution of this embodiment can be obtained.

[0074] The BBO cutting angle θ changes w...

Embodiment 3

[0076] According to the BBO crystal with a special cut angle described in embodiment 1 or 2, the difference is that,

[0077] When the wavelength of the fundamental frequency light is 1064nm, the phase matching angle θ of the BBO crystal is 32.1°; the azimuth angle φ of the BBO crystal is 11°.

[0078] When the wavelength of the fundamental frequency light is 1064nm, θ=32.1°, φ=11°, the effective nonlinear optical coefficient |d of the type II frequency doubling BBO crystal eff,II |, the effective nonlinear optical coefficient of type I sum-frequency BBO crystal |d eff,I |values ​​are 1.38, 0.79pm / V, far better than KDP, ADP and Gd x Y 1-x COB crystal (<0.6pm / V).

[0079] The length of the BBO crystal in the direction of light transmission is 9mm

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Abstract

The invention relates to a BBO crystal with a special chamfered angle, a triple-frequency optical converter and a working method of the triple-frequency optical converter. When the fundamental-frequency optical wavelength is gradually increased from 750 nm to 1200 nm, the phase-matching angle theta of the BBO crystal is gradually decreased from 42.1-52.1 degrees to 24.2-34.2 degrees, and the azimuth angle phi of the BBO crystal is 6-16 degrees; the length of the BBO crystal in the optical direction is 6-14 mm. The single BBO crystal can achieve high-efficiency cascade triple frequency of nearinfrared laser of wave bands, and ultraviolet or purple laser is output. The prepared triple-frequency optical converter has the advantages of being low in cost, high in anti-optical-damage threshold,wide in available band, large in effective nonlinear optical coefficient, large in output energy, high in conversion efficiency and the like, and the overall performance of the triple-frequency optical converter is superior to that of similar components made from ADP or KDP or GdxY1-xCOB crystals.

Description

technical field [0001] The invention relates to a special angle-cut BBO crystal, a triple-frequency optical converter and a working method thereof, and belongs to the technical field of laser and nonlinear optics. Background technique [0002] At present, bulk nonlinear optics (NLO) crystals are still the main medium for optical frequency upconversion, and KTP, KDP, BBO, LBO, etc. are commonly used. For the triple frequency (THG) of near-infrared lasers, it is usually realized by cascading frequency conversion. Traditionally, two nonlinear optical crystals are required: the first crystal generates frequency doubled waves (SHG), and the second one generates fundamental frequency waves. Perform a sum frequency (SFG) with an octave wave to produce a triple frequency wave. [0003] Chinese patent document CN105911793A discloses a cascaded optical frequency converter based on a single phosphate crystal and its application. The optical frequency converter includes a first beam s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35
CPCG02F1/3501G02F1/353G02F1/354
Inventor 王正平任宏凯亓宏伟许心光孙洵吴志心王梦霞
Owner SHANDONG UNIV
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